These tools are to assist a mapper when porting a old HL 1 (goldsource engine) to HL2 source MODs.

There are some decompile tools, an example dod to dods VMF/BSP example file and BSP_Tools by Botman.

You should use this tutorial when trying the method this package was assembled for. It will return you a very accurate port. It does require a learning curve but once you have done it once via the tutorial you will find it very helpful... if you want an absolutely accurate port from HL1 maps to HL2 Source maps.